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地基基础设计中参数取值问题与对策 被引量:2
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作者 余长伍 鲁爱军 张明明 《农村经济与科技》 2011年第5期188-189,共2页
在进行地基基础设计时会遇到一些计算参数的取值问题,其中容易出错的有基底宽、基础埋置深度、平均重度等参数的取值。通过参阅各种资料总结出了这些参数的取值规律,归纳如下,并辅之以图示和计算示例加以解释说明,以期达到解决对这些参... 在进行地基基础设计时会遇到一些计算参数的取值问题,其中容易出错的有基底宽、基础埋置深度、平均重度等参数的取值。通过参阅各种资料总结出了这些参数的取值规律,归纳如下,并辅之以图示和计算示例加以解释说明,以期达到解决对这些参数取值的疑惑。为了清晰、有条理的叙述结论,采取了提出疑问然后给出解答的模式。 展开更多
关键词 基底宽 基础埋置深度 平均重度 取值
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Some OWA operator weights determination methods with RIM quantifier
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作者 刘新旺 《Journal of Southeast University(English Edition)》 EI CAS 2007年第S1期76-82,共7页
Based on the quantifier guided method,an ordered weighted averaging(OWA)weights generating method under given orness level with regular increasing monotone(RIM)quantifiers is proposed.Then the RIM quantifier based OWA... Based on the quantifier guided method,an ordered weighted averaging(OWA)weights generating method under given orness level with regular increasing monotone(RIM)quantifiers is proposed.Then the RIM quantifier based OWA weights generating method is modified to make the generated weights be monotonic,which can be used to express the decision maker's consistent preference information.Finally,both of these weights generating methods are extended to their generic forms,so that they can generate the OWA weights for any ordinary elements set with any given aggregated value. 展开更多
关键词 ordered weighted averaging operator orness measure aggregation weights
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Zonal extraction technology and numerical simulation analysis in open pit coal mine 被引量:11
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作者 Chen Yanlong Cai Qingxiang +3 位作者 Shang Tao Peng Hongge Zhou Wei Chen Shuzhao 《International Journal of Mining Science and Technology》 2012年第4期487-491,共5页
In order to enhance coal recovery ratio of open pit coal mines, a new extraction method called zonal mining system for residual coal around the end-walls is presented. The mining system can improve economic benefits b... In order to enhance coal recovery ratio of open pit coal mines, a new extraction method called zonal mining system for residual coal around the end-walls is presented. The mining system can improve economic benefits by exploiting haulage and ventilation roadways from the exposed position of coal seams by uti- lizing the existing transportation systems. Moreover, the main mining parameters have also been dis- cussed. The outcome shows that the load on coal seam roof is about 0.307 MPa and the drop step of the coal seam roof about 20.3 m when the thickness of cover and average volume weight are about 120 m and 0.023 MN/m~ respectively. With the increase of mining height and width, the coal recovery ratio can be improved. However, when recovery ratio is more than 0.85, the average stress on the coal pillar will increase tempestuously, so the recovery ratio should also be controlled to make the coal seam roof safe. Based on the numerical simulation results, it is concluded that the ratio of coal pillar width to height should be more than 1.0 to make sure the coal pillars are steady, and there are only minor dis- placements on the end-walls. 展开更多
关键词 Extraction technologyNumerical simulationZonal miningResidual coalEnd-walls
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Breeding of New Processing Apricot Cultivar ‘Jinxiu'
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作者 Xiaohong WU Xiping ZHAO +4 位作者 Huanying TANG Xiancheng ZHANG Jingtao WANG Wenhui MA Liyong YUAN 《Agricultural Science & Technology》 CAS 2017年第11期2062-2063,共2页
‘Jinxiu' is a processing apricot(Armeniaca vulgaris L.) cultivar derived from the cross of ‘Chuanzhihong'בJintaiyang'.The fruit is oval-shaped with the ground color of orange and 1/4-1/2 sheet red... ‘Jinxiu' is a processing apricot(Armeniaca vulgaris L.) cultivar derived from the cross of ‘Chuanzhihong'בJintaiyang'.The fruit is oval-shaped with the ground color of orange and 1/4-1/2 sheet red in the surface. The average fruit weight is65.5 g, and the maximum value is 106 g. The flesh is orange, fine with very less fiber, toughness, less juice and freestone, and tastes sour and sweet. The soluble solid content is 12.5%. The edible rate is 95.8%. The fruit skin hardness is 12.9 kg/cm2 and storable. The preserved apricots have orange color and are tasty. The preserved yield is 40%. The fruit development period is 72 d. The fruit has high yield, and the fruit yield in full fruit period can reach 37 000 kg/hm2. ‘Jinxiu' was examined and approved by Hebei Examination and Approval Committee of Forest Tree Variety in 2013. 展开更多
关键词 APRICOT PROCESSING Culiivar
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The Effects of Size-fractionated Fish Hydrolysate in the Diet on Growth, and Feed Utilization of Turbot (Scophthalmus maximus)
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作者 Mingyan Huai Yongjian Liu +3 位作者 Lixia Tian Anlong Xu Huijun Yang Guiying Liang 《Feed & Livestock》 2010年第3期10-10,共1页
An 8-week growth trial was conducted to determine dietary arginine requirement for juvenile Pacific white shrimp Litopenaeus vannamei (Boone) with an initial average body weight of 0.47 g reared in low-salinity wat... An 8-week growth trial was conducted to determine dietary arginine requirement for juvenile Pacific white shrimp Litopenaeus vannamei (Boone) with an initial average body weight of 0.47 g reared in low-salinity water (0.50-1.50 g L-1). Six isonitrogenous and isoenergetic semipurified diets (crude protein 360 g/kg and gross energy 19.70 kJ/g) were formulated with fish meal and wheat gluten as the intact protein source. 展开更多
关键词 Litopenaeus vannamei ARGININE Requirement Growth performance Low salinity
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Genome-wide survey and analysis of microsatellites in the Pacific oyster genome: abundance, distribution, and potential for marker development
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作者 王家丰 亓海刚 +1 位作者 李莉 张国范 《Chinese Journal of Oceanology and Limnology》 SCIE CAS CSCD 2014年第1期8-21,共14页
Microsatellites are a ubiquitous component of the eukaryote genome and constitute one of the most popular sources of molecular markers for genetic studies. However, no data are currently available regarding microsatel... Microsatellites are a ubiquitous component of the eukaryote genome and constitute one of the most popular sources of molecular markers for genetic studies. However, no data are currently available regarding microsatellites across the entire genome in oysters, despite their importance to the aquaculture industry. We present the fi rst genome-wide investigation of microsatellites in the Pacifi c oyster Crassostrea gigas by analysis of the complete genome, resequencing, and expression data. The Pacifi c oyster genome is rich in microsatellites. A total of 604 653 repeats were identifi ed, in average of one locus per 815 base pairs(bp). A total of 12 836 genes had coding repeats, and 7 332 were expressed normally, including genes with a wide range of molecular functions. Compared with 20 different species of animals, microsatellites in the oyster genome typically exhibited 1) an intermediate overall frequency; 2) relatively uniform contents of(A)n and(C)n repeats and abundant long(C)n repeats(≥24 bp); 3) large average length of(AG)n repeats; and 4) scarcity of trinucleotide repeats. The microsatellite-fl anking regions exhibited a high degree of polymorphism with a heterozygosity rate of around 2.0%, but there was no correlation between heterozygosity and microsatellite abundance. A total of 19 462 polymorphic microsatellites were discovered, and dinucleotide repeats were the most active, with over 26% of loci found to harbor allelic variations. In all, 7 451 loci with high potential for marker development were identifi ed. Better knowledge of the microsatellites in the oyster genome will provide information for the future design of a wide range of molecular markers and contribute to further advancements in the fi eld of oyster genetics, particularly for molecular-based selection and breeding. 展开更多
关键词 microsatellites GENOME Pacific oyster Crassostrea gigas
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Heavy Metal Contamination of Agricultural Soils in Taiyuan, China 被引量:20
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作者 LIU Yong WANG Huifeng +1 位作者 LI Xiaoting LI Jinchang 《Pedosphere》 SCIE CAS CSCD 2015年第6期901-909,共9页
To evaluate the current state of the environmental quality of agricultural soils in Taiyuan City, a hotspot for China's industrial development, the concentrations of 8 heavy metals in soils were investigated by me... To evaluate the current state of the environmental quality of agricultural soils in Taiyuan City, a hotspot for China's industrial development, the concentrations of 8 heavy metals in soils were investigated by means of extensive sampling in farmlands, forestlands,and grasslands in the city. Statistical analyses and spatial distribution maps were used to identify the most significant heavy metal pollutants. The mean concentrations of As, Cd, Cu, Hg, Pb, Zn, Ni, and Cr were slightly higher than their background values in Taiyuan's topsoil, but were lower than the maximum permissible concentrations in the Chinese Environmental Quality Standard for agricultural soils. Farmland soils in Taiyuan had the highest average Cd, Cu, Hg, Pb, Zn, and Cr concentrations, but the As and Ni concentrations did not differ significantly among the farmland, forestland, and grasslands. Soil contamination by Cd, Cu, Hg, Pb,Zn, and Cr was mainly derived from farming practices, especially the use of sewage water for irrigation. In contrast, As and Ni might derive mainly from the soil parent material. The identification of heavy metal sources in agricultural soils may provide a basis for taking appropriate action to protect soil quality. 展开更多
关键词 environmental pollution farming practices sewage irrigation soil parent material soil quality
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